Dwuma a Vacuum Induction Melting (VIM) Di wɔ Pipe Processing mu

Wɔ paipu dwumadie mu no, vacuum induction melting (VIM) yɛ nkitahodiɛ titire wɔ ahosiesie a wɔde yɛ nneɛma a wɔde yɛ paipu a ɛkorɔn-awieɛ te sɛ nickel-based alloys ne titanium alloys. Ɛdenam ɔhyew a ɛkorɔn-a ɛyɛ hyew ne vacuum tebea a ɛka bom so no, ebetumi adu botae ahorow pii ho: nea edi kan no, ebetumi adi aduru a wɔde afrafra no so pɛpɛɛpɛ. Ɛma dade nneɛma a wɔde yɛ nneɛma no nwene denam anyinam ahoɔden a ɛma ɛyɛ hyew so, ɛde nneɛma a wɔde afrafra ka ho pɛpɛɛpɛ, ɛhwɛ nneɛma a ɛwom no fã so denneennen (a mfomso a ɛwɔ mu no sua sen anaasɛ ɛne no yɛ pɛ 0.05%), ɛkwati efĩ te sɛ S ne P (a nea ɛwom no sua sen anaasɛ ɛne no yɛ pɛ 0.001%), na ɛhwɛ hu sɛ nneɛma nketenkete a wɔde ka ho no yɛ pɛ; nea ɛto so abien no, ebetumi ayi mframa ne efĩ a ɛyɛ hyew afi hɔ. Wɔ vacuum tebea a ennu anaasɛ ɛne 10−3 Pa yɛ pɛ mu no, eyi mframa te sɛ H2, N2, ne O2 (a H2 sua anaasɛ ɛyɛ pɛ 1ppm ne O Ennu anaasɛ ɛyɛ pɛ 50ppm) ne efĩ a ɛba fam-melting-point a ɛba fam, na esiw pores ne mpaapaemu bere a wɔde ɔhyew reyɛ paipu ho adwuma, na ɛtew so oxide a wɔde ka ho na ama ɔbrɛ nkwa nna atu mpɔn; nea ɛto so abiɛsa no, ebetumi atew efĩ a ɛto so abien so. Vacuum a wɔato mu no ma mframa ne fononoo mu nneɛma a wɔde kata so no nkɛntɛnso tew, na ɛkwati sɛ nitride ne oxide a ɛka ho bɛba; nea ɛto so anan no, ɛto fapem ma nneɛma a wɔbɛyɛ akyiri yi. Ɛde induction stirring di dwuma de hwɛ hu sɛ nea wɔahyehyɛ ne ɔhyew a ɛwɔ melt no mu no yɛ pɛ, ɛtew component segregation so, ɛtew ingot grains no mu (efi mm level kosi μm level) denam cooling rate a ɛhwɛ so, na ɛma hot working plasticity tu mpɔn.